NEW MALLol'HAGA. • 133 



fuscous, duikcr on the posterior margins of the seg- 

 ments; last segment broad, narrow, with a fringe of 

 hairs along the rounding posterior margin. 



Menopon malleus Nitzscli (Plate IX, fig. 3). 



Germai's Mag. Ent., 1818, vol. iii, p. 301. 



Eureum malleui> Nitzsch, Bnrmeister, Huudb. d. Ent., 1840, vol. ii. 

 p. 441; Denny. Monofjraph. Anoplur. Brit., 1842, p. 28S; Giebel, 

 Insecta Kpizoa, 1874, )). •24!l; Piaget, Les Pediculiues, 1880, 

 p. G08, Supplement, 188'), p. 139, pi. xv, fig. 3. 



A single immature specimen from a Cliff Swallow. 

 Petrochelidon lanlfrons (Ontario, California), and an 

 adult female and an immature specimen from a Cactus 

 Wren, Heleodytes brunneicapillus (Ontario, California). 

 The single specimen of this species previously known 

 was collected by Nitzsch in 1814 from Hlrundo ruslica. 

 As the above named Cliff Swallow and Cactus Wren 

 were collected by the same person on the same day it 

 may be tliat the two individuals taken from the wren 

 are stragglers from the swallow. 



This species has heretofore been attributed to the 

 genus Eiircuin Nitzsch, the genus being based upon the 

 single specimen (which, though heretofore apparently 

 not so considered, is immature) of this species and a 

 very few specimens of another very different species, 

 clmicoide.,^ Nitzsch from the European Swift Cyifselus 

 a/>u.s-. Piaget has suspected that both these species are 

 merely rather aberrant members of the genus Menopon, 

 which position, as regards the species rnidleiis, at least, 

 we take unqualifiedly. The two species have been held 

 together partly through the usual conce})tion of the 

 near relationshin of the hosts; as Nitzsch savs, "liabitti- 

 tio in chtiidonnni familiit' (Germar's Mag. Ent., vol. 

 iii, p. 301, 1818). Now, in fact, the swallows and tlie 

 swifts are not nearly related at all, the swifts finding 



